MSR says: A low-profile, reusable coffee or tea filter that can be stored in just about any mug or cup.

Convenient and enviro-friendly, this reusable coffee/tea filter lets you brew up a cup without wasteful and messy paper filters. It’s low profile enough to be stored in just about any mug or cup and it weighs just .98 oz./28 g.

MSR's MugMate Coffee/Tea Filter isn't the epitome of going 'ultralight', but sometimes you need a few luxuries out on the trails and this is one of the lightest ways of going about getting a good cup of coffee. Excellently built with an almost universal design.